Hydraulic press



' S. J. F AZZIO HYDRAULIC PRESS Filed NOV. 5, 1945 March 23, 1948.

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HYDRAUL I C PRES S Filed Nov. 5, 1945 2 Sheets-Sheet 2 22? 1 1% zzz'a,

Patented Mar. 23, 1948 UNITED STATES PATENT orrlcs HYDRAULIC PRESS Santo J. Fazzio, Glassboro, N. J.

Application November 5, 1945, Serial No. 626,694

1 Claim. 1

One of the objects of the present invention is to provide a press that will be very accurate in its movement so that the pressure on the plastic disk will be even throughout the surfaces thereof.

As it is Well known to those skilled in the art, the hills and valleys in the record are very minute and hardly perceptible to the naked eye and it is therefore, most necessary when the disks are pressed between the matrices or dies, the pressure be applied to the disk in an even manner and that the various parts be in the desired perfeet alignment.

Still another object of the invention is to provide a piston that is most accurate in its movement, and to further provide mold shoes that may be readily swung into and out of an inoperative position, and when in their operative position, will be accurately aligned.

Still another object of the invention is to con struct the upper mold shoe so that it may be readily unlocked from its operative position, swung outwardly, lowered and then revolved 180, so that when it is desired to change the matrix or die, the clamping means for the matrix is face up and readily accessible.

With these and other objects in view, the invention consists in certain new and novel arrangements and combination of parts as will be hereinafter more fully described and pointed out in the claim.

Referring now to the drawings,

Fig. 1 is a side elevation of the hydraulic press, the dotted lines showing the mold shoes swung to an inoperative position, and the upper shoe being rotated 180";

Fig. 2 is a sectional view taken on line 2-2 of Fig. 1, the dotted line however showing the lower carrier swung to an inoperative position;

Fig. 3 is a fragmentary enlarged vertical sectional view of the lower part of the press;

Fig. 4 is a horizontal sectional view centrally of the bed plate taken on line 4-- i of Fig. 3;

Fig, 5 is a detailed plan of the guide plate for the lower end of the piston rod, and

Fig. 6 is an enlarged detail with parts broken away showing how the upper mold is pivoted to its supporting bracket.

At the outset, it might be mentioned that only that much of the press is shown that is necessary to understand the present invention and that the various valves, switches, cutoffs, steam and cold water connections that make the hydraulic press an automatic one, form no part of the present invention.

It will be also understood, that I have not illustrated the combined heating and cooling plates in the mold shoes as they per se form no part of the present invention.

Referring now for the moment to Fig. 1, there is fragmentarily shown, a part of a table or support I on which the press is mounted. This table actually extends for some distance beyond the press and is generally provided with a hot plate, (not shown), to Dre-heat the biscuit or disk to be molded.

There may also be seen, the rectangular bed plate 2 in which are mounted the three posts 3. To provide a securing means to hold the press tightly on the table, I make the lower ends of the posts extend for some distance through the bed plate 2 so that they can be passed through the table I and then locked by the nuts 5.

It will be noticed that each post 3 is provided with a shoulder 6 near its lower end and a shoulder 1 near its upper end. These shoulders will be accurately machined so that the distance between the shoulders on each post is exactly the same. There is also an upper bed plate 8 locked in place, so that the distance between the adjacent faces of the upper and lower plates is equal throughout the said faces.

It will be noticed that these posts 3 at their upper ends also extend through the plate 8 so that the bed plate 8 may be tightly locked in position by the nuts 9. It might be mentioned in passing that the surfaces of these posts 3 are chromium plated so that the one that is used to support the mold shoes will permit the shoes to slide up and down in an even manner.

Referring now for the moment to Fig. 3 there will be seen the cylinder consisting preferably of a relatively thick metal ring ill which is welded as at l l, to the bed plate 2.

In the bed plate 2 and centrally of the ring it there is formed the opening l2 through which passes the stem or piston rod !3, as will be shortly mentioned. Concentrically, of the opening l2 are the small apertures l4, through which will pass the fluid (not shown) under hydraulic pressure for operating the piston.

Welded to the under surface of the bed plate 2, is the housing l5 in which is mounted the heavy coil spring 16, the lower end of the spring bee,- ing against the circular guide plate IT Which is internally threaded and held in position on the threaded lower end of the stem or piston rod l3.

This plate I1 is provided with the apertures I9 about the central opening 20 of the plate so that the fluid pressure may pass through said plate.

It will be understood that the housing I5 is concentrically arranged with respect to the piston rod I3 and is accurately machined, and in the same manner the guide plate I I is accurately machined so that the piston rod or stem l3 will be guided in an accurate manner in its upward and downward strokes.

Threaded to the lower end of the housing I5 is the cap 2| which is provided internally with a chamber 22 to which leads the pressure feed line 23.

Fitting within the cylinder I is the piston or ram 24 and to its bottom wall 25, is welded the upper end of the piston rod I3 as may be seen.

at 26. Welded to the bottom wall 25, is the ring 21 which forms the cylindrical side walls It will be noticed in forming'the cylinder l0 and the piston 24, the respective parts are all welded as the pressure on the piston for operating purposes is generally about .1000 lbs. to the square inch.

As before mentioned, I have not shown the valve operating mechanisms but it will be understood that when hydraulic pressure is applied through the feed line 23, the fluid will pass through the apertures I 9 in the plate I1 and through the apertures I 4 in the bed plate 2 and drive the piston upwardly. When the pressure is relieved the spring I6 being under compression and bearing on the plate I 'I, will quickly lower the piston to the position shown in Fig. 3.

It will also be seen that with the arrangement just above outlined, the depending housing I not only encases the spring, but acts as a bearing or guide for the piston rod with its plate I'I so that not only is the piston guided accurately in its cylinder, but it is also held'in accurate alignment by the guide plate I! at the lower end of thepiston rod.

This is an advantage where accurate moldin is necessary and a slidable mold shoe must be elevated in an even manner. 7 Having described the piston, cylinder and the body of the press, reference is now made to the molding shoes and the manner in which they are operated, loaded and unloaded for the successive forming of the records.

It will also be understood that the molding shoes proper are of a conventional type and I have not illustrated in detail. the heating and coolin chambers thatrfit within the mold shoes into which steam and cold water are alternately supplied.

I have illustrated, however, the manner in which the upper mold shoe may be unlocked, lowered, swung out to an inoperative position and then revolved 180 so that the'clampingring that holds the matrix or die in position, may be quickly removed and a new die inserted, when it is desired to mold 'a different subject matter on the record. 1

It will, of course, be understood that the records are molded on their opposite faces at the one time, but it is not-necessary to revolve the lower mold shoe when a new matrix is to be supplied as this mold shoe will bein a face up position. a

It will also be understood that the mold shoes are alike with the exception that in one, the bracket pivots, while the other does not. Also the one shoe will be provided with registering dowel pins while the other shoe will have registering holes for the'dowel pins.

Referring now for the moment to Figs. 1, 2, and 6, it will be seen the upper mold shoe 3!) is a relatively flat circular plate having the spaced ears .tI. On the under surfaces of these ears 3!, are the small registering openings 32 may be seen in Fig. 2, there is a clamping ring as that is held in place by the screws 35 and this clamping ring will tightly hold a copper matrix in the mold.

As heretofore mentioned, the mold shoes are of a conventional type.

However, to secure this mold shoe 39 to the under surface of the bed plate 8, I have provided the bolts 35 with the Wing nuts 3? thereon, these bolts being threaded at their lower ends as at 35 into the mold shoe. I

I also provide a sliding bracket ill for the mold shoe 3!}, and this is shown in detail in Fig.6.

It will be noticed there is a collar M having a central bore 52, and this collar is welded to a plate 43 after the plate has been drilled and counterbored as at it. Also, before the collar is welded to the plate a headed pivot pin 45 is inserted through the opening ie so that a further cooperating plate it with a central bore 41 may be placed in position. This latter bore is counter sunk at its lower so that the pivot pin 45 may be peened or welded in the counter sink. Thus, the plate it may be revolved with relation to the plate :33 and its bracket M. The. inner plate 35 may then be fastened by the screws 48 to a side of the mold shoe 39.

It will be understood that the bore 42 in the bracket 4:3 is accurately reamed so that there will be no wobbling or tilting of the shoe as the bracket and shoe slide up and down on its supporting posts 3. V a

It will thus beseen that when itis desired to replace a metal matrix or die in the upper shoe,

the wing nuts 3? will be removed, the shoe lowered and then swung to the right from beneath its top plate 3, and due to the pivotal connection just mentioned the shoe 39 may be turned over to the position shown in dotted lines in Fig. 1. Then an operator may remove the clamping ring 3 3 by removing the screws 35 and then substitute a new die and again lock the clamping ring 34 in place.

Then the shoe may again be revolved so that it will be face down, swung inwardly and the lower it and then swing it from beneath the press and revolve it, thus doing away with any manual lifting.

The lower shoe G9 is the same as the upper shoe 30 with the exception in this instance its bracket 50 is rigidly fastened by the bolts to the shoe. In other words this shoe may be swung in the same manner as the upper shoe and dropped to the lower bed plate but cannot be revolved, which is unnecessary due to the fact that it always remains face-up. I also provide a handle 52 for convenience of swinging the shoe into an operative or inoperative position.

To provide a stop for the shoe 49, it will be noticed the vertically extending rod 53 is secured to the upper plate 8 and it will also be noticed that I provide a fiat surface 54 on the contacting ear 3| so that when the shoe is swung into position as shown in Fig. 2, it will be positioned in a true aligned position with the upper shoe.

The lower plate is also provided with dowel pins 33 heretofore mentioned to register with the openings 32 in the upper shoe.

The stop 53 will also act as a stop for the upper shoe 3!] when the shoe is placed in position to be held by the heretofore mentioned bolts 35.

After each operation of the press, the handle 52 will be grasped and the shoe swung to the right, lowered to the bed plate and the molded disk removed, then a new preheated disk is placed in position on the shoe and the shoe again raised, swung back to its aligned position on the supporting plate 29, when the piston will again operate to mold or press out another record.

From the foregoing, it will be seen that I have produced a press that will be most accurate in its operations so that an even pressure will be exerted on the records throughout their surface and wherein the lower shoe may be raised and lowered in an accurate manner with no 6 chance of the collar binding due to the true vertical movement of the piston. Also-the upper shoe may be quickly loosened, lowered, revolved and swung when it is desired to put in a new matrix.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

In a hydraulic press, a bed plate, an upper plate, posts extending between the same, a cylinder, a hydraulically operated piston and piston rod movable in said cylinder, a housing secured to the under surface of the bed plate and centrally beneath said cylinder in which said piston rod travels, means in the housing for accurately guiding said piston rod in said housing, means in said housing for returning the piston to its lower position, two mold shoes provided with collars swingingly and slidably mounted on one of said posts, the lower of said shoes adapted to be elevated and lowered by the said piston, means for locking the upper of said mold shoes to the under surface of the upper plate, and a pivotal connection between the upper shoe and its collar whereby the mold shoe may be revolved one hundred eighty degrees about its horizontal axis after being swung to an inoperative position.

SANTO J. FAZZIO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,520,214 Thomson Dec. 23, 1924 1,525,945 Matter Feb. 10, 1925 Christenson Feb. 1, 1938 

